NIO 双select模式的demo

最简单的双select模式，一个用来接收请求连接，一个请求读写

package nio;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;



public class NIOServer {

	private ByteBuffer recBf =  ByteBuffer.allocate(1024);
	private Selector selector;//接收select
	private Selector proccessor;//读写
	
	
	public NIOServer(){
		try {
			ServerSocketChannel ssc = ServerSocketChannel.open();
			ssc.configureBlocking(false);
			ServerSocket ss = ssc.socket();
			ss.bind(new InetSocketAddress(8888));
			selector = Selector.open();
			
			ssc.register(selector, SelectionKey.OP_ACCEPT);
			System.out.println("start 8888");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	class Handler extends Thread{
		public Handler(String name,SocketChannel client){
			try {
				if(proccessor == null){
					proccessor =Selector.open();
				}
				client.register(proccessor, SelectionKey.OP_READ);
				
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			this.setName(name);
		}
		
		public void run(){
			System.out.println("begin run");
			try {
				while(proccessor.select()>0){
					Set<SelectionKey> selectedKeys = proccessor.selectedKeys();
					Iterator<SelectionKey> it = selectedKeys.iterator();
					while(it.hasNext()){
						SelectionKey sk = it.next();
						it.remove();
						handler(sk);
					}
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	public void startAcceptor(){
		try {
			while(selector.select()>0){
				Set<SelectionKey> keys = selector.selectedKeys();
				Iterator<SelectionKey> it = keys.iterator();
				
				while(it.hasNext()){
					SelectionKey sk = it.next();
					
					it.remove();
					handler(sk);
				}
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	private void handler(SelectionKey sk){
		ServerSocketChannel service;
		SocketChannel client =null;
		
		if(sk.isAcceptable()){
			service = (ServerSocketChannel) sk.channel();
			try {
				client = service.accept();
				client.configureBlocking(false);
				new Handler("s",client).start();
				
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			
			
		}
		if(sk.isReadable()){
			client = (SocketChannel)sk.channel();
			recBf.clear();
			try {
				int count = client.read(recBf);
				if(count>0){
					System.out.print(new String(recBf.array(),0,count));
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
		
	}
	
	public static void main(String[]a){
		NIOServer n = new NIOServer();
		n.startAcceptor();
	}
}

window 下，运行cmd ，telnet localhost 8888 即可测试。